Question

Question. Give the structure corresponding to each of the following names.

a. trans-2-ethynylcyclopentanol

b. 4-tert-butyldec-5-yne

c. 3,3,5-trimethylcyclononyne

Short answer

a.

b.

c.

Step-by-step solution

Structure of Alkynes

The following steps have to be followed while naming alkynes,

Find the parent name by choosing the longest carbon chain and give preference to the functional groups. Then add substituents to the appropriate carbon and the alkyne must be mentioned by the suffix -yne.

Molecular structures

a. The -OH group is placed on C1 with the ethyne group on C2.

Structure of trans-2-ethynylcyclopentanol

b. The tert-butyl group is located on C4 of the ten-carbon chain.

Structure of 4-tert-butyldec-5-yne

c. The alkyne group is located on C1 with two methyl groups on C3 and one on C5.

Structure of 3,3,5-trimethylcyclononyne